Interface unit



FIG. 1 is a perspective view of an interface unit showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines illustrate unclaimed portions of the interface unit andform no part of the claimed design.

CLAIM The ornamental design for an interface unit, as shown anddescribed.